SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b3c738f700c45201c673b3c61d7a5ecb91aa41e62c2f830913b6b39afd4d967' 
  AND token = 'Oh0XPfYBXNJfqeW5fTReNBH//sjrMPXPux+Nhlw/VUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}